Hammer



FIG. 1 is a perspective view of a hammer, showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines depict portions of the hammer in which the design is embodied that are not considered part of the claimed design. 

CLAIM The ornamental design for a hammer, as shown and described. 